EP0760425B1 - Dispositif d'injection - Google Patents

Dispositif d'injection Download PDF

Info

Publication number
EP0760425B1
EP0760425B1 EP96111968A EP96111968A EP0760425B1 EP 0760425 B1 EP0760425 B1 EP 0760425B1 EP 96111968 A EP96111968 A EP 96111968A EP 96111968 A EP96111968 A EP 96111968A EP 0760425 B1 EP0760425 B1 EP 0760425B1
Authority
EP
European Patent Office
Prior art keywords
solenoid valve
piston
nozzle
pressure
pump
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP96111968A
Other languages
German (de)
English (en)
Other versions
EP0760425A1 (fr
Inventor
Helmut Dipl.-Ing. Rembold
Walter Dipl.-Ing. Teegen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE19619522A external-priority patent/DE19619522A1/de
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0760425A1 publication Critical patent/EP0760425A1/fr
Application granted granted Critical
Publication of EP0760425B1 publication Critical patent/EP0760425B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
    • F02M25/022—Adding fuel and water emulsion, water or steam
    • F02M25/025—Adding water
    • F02M25/03—Adding water into the cylinder or the pre-combustion chamber
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
    • F02M25/022—Adding fuel and water emulsion, water or steam
    • F02M25/0221—Details of the water supply system, e.g. pumps or arrangement of valves
    • F02M25/0225—Water atomisers or mixers, e.g. using ultrasonic waves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
    • F02M25/022—Adding fuel and water emulsion, water or steam
    • F02M25/0227—Control aspects; Arrangement of sensors; Diagnostics; Actuators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M43/00—Fuel-injection apparatus operating simultaneously on two or more fuels, or on a liquid fuel and another liquid, e.g. the other liquid being an anti-knock additive
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M43/00—Fuel-injection apparatus operating simultaneously on two or more fuels, or on a liquid fuel and another liquid, e.g. the other liquid being an anti-knock additive
    • F02M43/04—Injectors peculiar thereto
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B3/00—Engines characterised by air compression and subsequent fuel addition
    • F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • the invention relates to an injection device combined fuel injection, in particular Diesel fuel, and additional fluid, in particular Water, in at least one combustion chamber Internal combustion engine, in particular a diesel engine, which in Preamble of claim 1 defined genus.
  • the combined injection of fuel and Additional liquid is used, especially in diesel engines reduce nitrogen oxide and soot emissions.
  • the amount of fuel over that Injection valve for each delivery stroke of the pump piston is hosed down by the rotation of the pump piston controlled.
  • a change in the fuel injection quantity by turning the pump piston also causes similar change in the pressed into the nozzle space Water volume in the subsequent stroke of the pump piston below the Effect of the additional cam. It is always a solid one Fuel / water ratio maintained.
  • Means another 3/2-way solenoid valve with spring return the solenoid valve arrangement can, if necessary, the storage of Water in the nozzle area can be stopped or changed.
  • the injection device according to the invention with the characteristic features of claim 1 has in contrast the advantage that on the one hand there is no additional cam on the Fuel injection pump so no changes made must be, and that on the other hand, the solenoid valve assembly can be realized much cheaper.
  • the Pressure generator one via a check valve on one Pre-feed pump connected separating piston, which by Fueling against a return spring is displaceable and an additional amount of liquid displaced, one connected to the separating piston Spring accumulator with storage cylinder, storage spring and Storage piston and a the displacement of the Accelerometer sensing displacement piston.
  • a hydraulically controlled Switching element arranged with its control input on Delivery outlet of the fuel injection pump connected and is designed so that it is above a pressure which is about the Stand pressure set by the constant pressure valve in the nozzle area corresponds, is closed.
  • the solenoid valve assembly consists of inexpensive, the input side of each Delivery output of the fuel injection pump, preferably via a check valve connected 2/2-way solenoid valves with spring return, of which the first solenoid valve output side on the relief line and the second Solenoid valve is on the output side of the separating piston.
  • the is suitable for higher speeds, there is Solenoid valve arrangement in turn from the inexpensive 2/2-way solenoid valves with spring return.
  • the first solenoid valve is now on the input side with the conveyor output Fuel injection pump, preferably via a Check valve, and on the outlet side with the Relief line and the second solenoid valve on the inlet side with the separating piston and also on the output side with the Relief line connected.
  • the solenoid valve is another check valve with the Separating piston or facing the second solenoid valve Flow direction arranged, the flow cross section is larger than that of the solenoid valve.
  • a controller the solenoid valve arrangement provided in such a way that for the duration of fuel injection the two solenoid valves close the second with the end of fuel injection Solenoid valve opens on a first one derived from the displacement sensor Control signal out that when a predetermined Displacement path of the accumulator piston triggered in the spring accumulator the second solenoid valve closes and the first Solenoid valve opens again and a second from the travel sensor triggered control signal that after the return of the Storage piston of the spring accumulator in its basic position is triggered, the second solenoid valve opens again.
  • the pressure generator has a pressure intensifier with one against one Return spring displaceable step piston, which with its larger diameter piston one on the Solenoid valve arrangement connected control chamber and with its smaller diameter pistons on the pre-feed pump connected displacement chamber limited.
  • Metering device for the additional liquid also belongs Distributor with a distributor cylinder that has a plurality of radial radially evenly distributed Has drainage holes and with a rotating therein, from the fuel injection pump driven distributor shaft, one on the displacement chamber of the pressure booster connected, one after the other when the distributor cell rotates communicating with each drain hole Has distributor bore. There is one at each drain hole the metering device leading metering line connected.
  • the Solenoid valve arrangement is 5 here from at least a first and a second 2/2-way solenoid valve with spring return realized, which are connected in series, the first solenoid valve on the inlet side at the delivery outlet, the Fuel injection pump and the second solenoid valve is connected to the discharge line on the output side.
  • the control chamber of the pressure intensifier is over a Check valve with the pressure booster facing Flow direction on the connecting line between the two solenoid valves connected.
  • the control of the Solenoid valves are made in such a way that for the duration of the Fuel injection closes the first solenoid valve At the end of fuel injection, the first solenoid valve opens and after a predetermined period of time the second Solenoid valve closes, which opens again when the Pump piston of the fuel injection pump its upper Has passed dead center.
  • the one shown in Figure 1 in the block diagram Injection device for the combined injection of Fuel, here diesel fuel, and of additional liquid, here water, in an internal combustion engine, here diesel engine, has one of the number of cylinders of the diesel engine corresponding number of injectors 10 for Fuel injection into the combustion chamber of each Combustion cylinder, each having a nozzle body 11 with end-side injection opening 12 and this upstream Nozzle chamber 13 and one which controls the injection opening 12
  • Nozzle needle 14 comprises axially in the nozzle body 11 is guided.
  • the nozzle needle 14 is in in a known manner under spring pressure on a nozzle body 11 trained valve seat and lifts at a sufficient Fuel pressure in the nozzle chamber 13 (injection pressure) from Valve seat from, whereby the injection opening 12 for spraying of the mixture of fuel and water in the combustion chamber of the Combustion cylinder is released.
  • the nozzle room 13 is connected to two nozzle connections 15, 16.
  • the Injection nozzle 10 is together with a constant pressure valve 17, a first check valve 18, a second Check valve 19 and a hydraulically controlled Switching element 20 to form a unit, the so-called nozzle module 30, summarized, each a combustion cylinder of the Diesel engine is assigned.
  • the nozzle module 30 has one Connection 21 for a to a fuel injection pump 23rd leading injection line 22, a connection 24 for a Water metering device 25 and a connection 26 for the Metering device 25 to the fuel injection pump 23 subsequent solenoid valve assembly 27.
  • the Equal pressure valve 17 connects the port 21 for the Injection line 22 with the nozzle connection 15 on the nozzle body 11, the second check valve 19 connects the port 21 for the injection line 22 with the connection 26 for the Solenoid valve assembly 27, wherein the flow direction of the second check valve 19 from port 21 to port 26 points.
  • the connection 24 for the metering device 25 is over the hydraulically controlled switching element 20 and the first Check valve 18 with the nozzle connection 16 on the nozzle body 11 connected.
  • the control connection of the switching element 20 is connected to the connection 21 for the injection line 22.
  • a return spring 28 transfers the switching element 20 into its open position when the pressure on the control connection Value that corresponds to that of the constant pressure valve 17 in Nozzle space 13 falls below the set pressure.
  • the switching element 20 is above this pressure value closed and blocks the flow to the injector 10.
  • the fuel injection pump 23 of a known type, the both an in-line injection pump and one Distributor injection pump can be in Figure 1 only indicated symbolically. With a series injection pump is in a known manner for each injector 10 Pump element is provided in which a lifting movement executing pump piston fuel from one Fuel supply 29 sucks and with injection pressure in the Injection line 22 promotes. At a Distributor injection pump is just a pump piston provided a rotational movement in a known manner and performs a lifting movement at the same time, with each Pump piston stroke one of several distributor bores is controlled, each on an injection line 22nd are connected.
  • the metering device 25 has a prefeed pump 31 for Pumping water from a water tank 32 and one Pressure generator 33, which from the pre-feed pump 31st pumped water pressurizes above the Stand pressure is that of the constant pressure valve 17 closed injector 10 upright in the nozzle chamber 13 is obtained.
  • the output of the pressure generator 33 is over a metering line 34 with the connection 24 of the nozzle module 30 connected.
  • the fuel pressure of the fuel injection pump 23 is used, for which the input of the pressure generator 33 via the Solenoid valve assembly 27 with fuel injection pump 23 is connected, more precisely, to the terminal 26 of the Nozzle module 30 is connected.
  • the pressure generator 33 consists of Figure 1 from a here only shown schematically Separating piston 35, which is a fuel chamber from a water chamber separates and against the pressure in the fuel compartment with a Return spring 36 is loaded, and also only one schematically shown spring accumulator 37 with Storage cylinder, storage spring and storage piston, the one Storage space limited and by the storage spring 38 against the Storage pressure in the storage space is loaded.
  • the exit of the Pre-feed pump 31 is connected to the water space of the separating piston 35 and this with the storage space of the spring accumulator 37 connected, which in turn via the metering line 34 on Port 24 of the nozzle module 30 is located.
  • the spring accumulator 37 is equipped with a displacement sensor 39, which is the displacement path of the accumulator piston in the spring accumulator 37 is sensed.
  • the solenoid valve assembly 27 consists of two inexpensive 15th 2/2-way solenoid valves 41, 42 with spring return, the connected on the input side to the connection 26 on the nozzle module 30 are.
  • the first solenoid valve 41 is located on one Relief or return line 40 and the second Solenoid valve 42 on the fuel chamber of the separating piston 35.
  • Both solenoid valves 41, 42 are in the basic position, i.e. at excited magnet, in the open position and give the Free fuel flow.
  • the connection of further nozzle modules 30 to the metering device 25 and to the Solenoid valve assembly 27 is dashed by 25 Representation of further connections 26 of nozzle modules 30 and further metering lines 34 indicated.
  • the individual is Control sequence shown in the functional diagram of Figure 3.
  • Curve a shows the stroke of the pump piston in the Fuel injection pump 23, the curve b the stroke of the first Solenoid valve 41, the curve c the stroke of the nozzle needle 14 in the injector 10, the curve d the stroke of the second Solenoid valve 42, the curve e the displacement of the Separating piston 35, the curve f the displacement of the Storage piston in the spring accumulator 37, the curve g the stroke of the Switching element 20, the curve h the pressure curve at the input of the check valve 18 and the curve i the pressure curve in the injection line 22.
  • the fuel pressure here becomes this used to build up pressure in the water system and that Spring 37 with the required amount of water supply (curves e and f).
  • the displacement sensor 39 monitors the Displacement of the accumulator piston in the spring accumulator 37 and gives a corresponding actual signal to the control unit. Is a predetermined displacement path of the accumulator piston is reached, i.e. a certain amount of water in the spring accumulator 37 stored, the control unit closes the second Solenoid valve 42 again (curve d).
  • the valve arrangement 27 here again consists of the two 2/2-way solenoid valves 41, 42 with spring return and an additional check valve 43.
  • the first Solenoid valve 41 is again on the input side at the connection 26 of the nozzle module 30 and on the output side on the Relief line 40 connected.
  • the second solenoid valve 42 is on the input side at the input of the separating piston 35 - and thus on this fuel compartment - and on the output side also connected to the relief line 40.
  • the Check valve 43 is on the one hand with the connection 26 and on the other hand connected to the input of the separating piston 35, is therefore between the two inputs of the solenoid valves 41, 42, the flow direction of the check valve 43 to the separating piston 35 or to the second solenoid valve 42.
  • the flow cross section of the check valve 43 is dimensioned much larger than that of the second solenoid valve 42, so that after opening the second solenoid valve 42 for End of the injection process even when it is open Solenoid valve 42 a pressure in the fuel chamber of the separating piston 35 can build.
  • the injection pump works with the modified solenoid valve assembly 27 is the same as described for Figure 1. This also applies in FIG. 3 Function diagram shown in the same way.
  • Figure 4 is another embodiment of a Injection device shown in the block diagram. So far Components of this injection device with those in FIG. 1 match, they are provided with the same reference numerals.
  • the structurally identical nozzle 10 is in the same way as in FIG. 1 on the one hand via the constant pressure valve 17 and the Injection line 22 with the delivery output of Fuel injection pump 23 and on the other hand Check valve 18 and the metering line 34 with the Metering device 25 connected for water. Between the Fuel injection pump 23 and the metering device 25 again the solenoid valve assembly 27 turned on.
  • metering device 25 has a prefeed pump 31, the water from a water tank 32 over a Pressure holding valve 44, which is set to approximately 5 bar, promotes in the circuit back to the water tank 32, and the Pressure generator 33, which here is the pressure intensifier 45 is trained.
  • the metering device 25 also includes Distributor 46, which has a distributor cylinder 47 with a Plurality of evenly distributed over the circumference arranged drain holes 48 and one in Distributor cylinder 47 rotating distributor shaft 49 with a radially opening at the circumference of the distributor shaft 49 Distributor bore 50, which in the rotation of the Distributor shaft 49 in succession temporarily with 10 each one of the drain holes 48 comes to congruence.
  • the Pressure intensifier 45 has one of a piston spring 51 loaded stepped piston 52, the larger diameter Piston part 521 a control chamber 53 and its smaller-diameter piston part a displacement chamber 54 limited.
  • the displacement chamber 54 is via an inlet valve 55 with the output of the pre-feed pump 31 and via Exhaust valve 56 with the distributor bore 50 in the Distributor shaft 49 of the distributor 46 connected to the Drain bores 48 each to an injection nozzle 10 leading metering line 34 is connected.
  • the number of Drain holes 48 thus corresponds to the number of available Injection nozzles 10, which in turn by the number of existing combustion cylinder of the diesel engine determined is.
  • Inlet valve 55 and exhaust valve 56 are as Check valves designed.
  • the solenoid valve arrangement 27 in turn consists of two 2/2-way solenoid valves 41 and 42 with spring return.
  • the two solenoid valves 41, 42 are connected in series, wherein 30 the first solenoid valve 41 on the input side with a Delivery output of here as a distributor injection pump trained fuel injection pump 23 and the second Solenoid valve 42 on the output side with the relief line 40 is connected, which leads back to the fuel supply 29.
  • the Piston spring 51 engages on the larger-diameter piston part 521 of the step piston 52 and searches for this against the pressure to move in the control chamber 53.
  • the distributor shaft 49 in the distributor 46 is from that not shown here Distributor piston of the fuel injection pump 23 synchronously driven. It is also possible to function the distributor 46 through additional holes and control grooves in the Integrate distributor piston immediately.
  • the distributor piston passes through the Fuel injection pump 23 that shown in Figure 5 Lift curve from its bottom dead center UT to its top Dead center OT.
  • the distributor piston passes through the stroke curve in FIG his top dead center OT to his bottom dead center UT.
  • the so-called control edge begins after closing through the distributor piston with the solenoid valve 41 closed fuel delivery. This is area I in Figure 5, within the fuel via the injector 10 in the Combustion chamber in the combustion cylinder of the diesel engine - together injected with the upstream water in the nozzle chamber 13 becomes.
  • the injection is ended by opening the first solenoid valve 41 so that the closing time of the first Solenoid valve 41 also the amount of the injector 10th sprayed fuel determined.
  • the fuel With opening the Solenoid valve 41, the fuel initially flows over the open solenoid valve 42 in the relief line 40 and from there back to the fuel supply 29. After a predetermined time interval from which the The amount of water to be added to the injector 10 is determined, closes the second solenoid valve 42, and in the remaining one Delivery stroke of the distributor piston, the fuel flows into the annular control chamber 53 of the pressure booster 45. This is area II in FIG. 5.
  • the stepped piston 52 of the Pressure intensifier 45 gives way while compressing the Piston spring 51 upwards and pulls into the Displacement chamber 54 via the inlet valve 55 a appropriate amount of water.
  • the control pressure in the Control chamber 53 is about 25 bar, so it is clearly under the nozzle opening pressure in the injection line 22.
  • the distributor bore 50 corresponds to that on the 35th Dosing line 34 connected drain hole 48, and that Water is now from the displacement chamber 54 on the Outlet valve 56, the metering line 34 and the check valve 18 stored in the nozzle chamber 11 of the injection nozzle 10. The the amount of fuel displaced flows through the Equal pressure valve 17 and the injection line 22 in the Suction chamber of the fuel injection pump 23 back.
  • the Distributor design uses an in-line injection pump, at which has a separate pump element for each injection nozzle 10 with pump piston is provided for each pump element a first solenoid valve 41 is required.
  • Connection line 58 between the two solenoid valves 41, 42 to separate at positions A and B and again via a Parallel connection of several check valves 59 as they is shown in dashed lines in Figure 4 to connect.
  • the Number of check valves 59 corresponds to the number of existing pump elements of the fuel injection pump, thus the number of injectors to be supplied 10 and thus the number of existing first solenoid valves 41
  • Check valves 59 are installed so that their Flow direction always from the respective first Solenoid valve 41 to the second only existing Solenoid valve 42 has.
  • the drive of the distributor shaft 49 takes place in the in-line injection pump via the Pump pistons driving the individual pump elements In-line injection pump camshaft.
  • a modified pressure intensifier 45 is shown in FIG Shown schematically longitudinal section, which is also in the Injection device according to Figure 4 can be used.
  • the two pistons 521 and 522 are not one one-piece stepped piston but separated into Bores 61, 62 of a housing 60 are axially displaceable 35 guided.
  • a plunger 64 is axial slidably guided, the front of the one hand on the Piston 521 and on the other hand on the piston 522 non-positively is present.
  • the non-positive system is through the Piston spring 51 and one in the displacement chamber 54 insert pressure spring 65 made.
  • the Displacement chamber 54 is the same as in FIG.
  • Control chamber 53 is on the input side Check valve 57 on solenoid valve assembly 27. On the output side, it is connected via a throttle 66 Relief line 40 connected. Such a throttle 66 for Drain control chamber 53 until the next pump piston stroke the fuel injection pump 23 is also in the Pressure intensifier 45 is provided in FIG. 4.
  • the pressure intensifier 45 is the Realization of the stepped bore to accommodate pistons 521, 522 less critical than with the one-piece step piston 52 in Figure 4 because of the exact alignment of the different Bores 61 - 63 can be omitted.
  • the Dimensioning is important to ensure that the counterforce the water-side piston 522 is smaller than the sum of the spring force of the spring 65 and the force of the water pressure in the displacement chamber 54.
  • the counterforce results resulting from the cross-sectional area of the plunger 64 and the pressure in the control chamber 53.
  • the invention is not based on those described above Embodiments limited. So as Additional liquid instead of water is also an alternative Fuel, for example alcohol fuel, is used through which the ignition conditions of the Diesel fuel can be improved.
  • Fuel for example alcohol fuel

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Water Supply & Treatment (AREA)
  • Fuel-Injection Apparatus (AREA)

Claims (13)

  1. Installation d'injection pour injecter de manière combinée du carburant notamment du gasoil et un additif liquide notamment de l'eau, dans au moins une chambre de combustion d'un moteur à combustion interne notamment d'un moteur diesel comprenant :
    au moins un injecteur (10) associé à une chambre de combustion pour l'injection de carburant, cet injecteur comprenant un corps (11) avec un orifice d'éjection (12) et en amont de celui-ci, une chambre d'injecteur (13) communicant avec deux branchements d'injecteur (15, 16) distincts, ainsi qu'une aiguille d'injecteur (14) fermant l'orifice d'éjection (12) et l'ouvrant sous l'effet de la pression d'injection,
    une pompe d'injection de carburant ayant au moins un piston pour fournir du carburant à la pression d'injection à au moins une sortie d'alimentation reliée par l'intermédiaire d'une soupape isobar (17) à un branchement (15) de l'injecteur (10),
    un dispositif de dosage de liquide (25) relié par une conduite de dosage (34) et un clapet antiretour (18) en aval, avec l'autre branchement (16) de l'injecteur (10) pour introduire la quantité d'additif liquide dans la chambre (13) de l'injecteur (10), cette installation comprenant une pompe de préalimentation (31) et un générateur de pression (33) sollicité par le carburant de la pompe d'injection de carburant (23) qui génère dans la conduite de dosage (34) une pression de liquide, supérieure à la pression statique maintenue par la soupape isobar (17) en dehors de l'injection de carburant dans la chambre (13) de l'injecteur (10), et
    un dispositif à distributeurs (27) prévu entre la pompe d'injection de carburant (23) et le générateur de pression (33) pour fournir en carburant le générateur de pression (33), pour commander l'ouverture d'une conduite de décharge (40),
    caractérisée en ce que
    le dispositif à distributeurs à tiroir (27) du côté de la pompe d'injection de carburant est branché sur au moins une sortie d'alimentation (26) en amont de la soupape isobar (17) et
    le dispositif à distributeurs (27) est commandé pour que pendant la course d'alimentation du piston de pompe, la pompe d'injection (23) d'une part se ferme au début du transfert de carburant et d'autre part s'ouvre à la fin de l'injection et la sortie de transfert de la pompe d'injection de carburant (23) est reliée pendant une durée prédéterminée de la course de transfert, restant du piston de pompe, avec le générateur de pression (33) du dispositif de dosage (25).
  2. Installation selon la revendication 1,
    caractérisée en ce que
    le générateur de pression (33) comprend un piston séparateur (35) raccordé pour l'additif liquide à une pompe de préalimentation (31), ce piston pouvant coulisser sous la sollicitation du carburant contre la force d'un ressort de rappel (36) et refouler ainsi une quantité d'additif liquide,
    un accumulateur à ressort (37) est relié au piston séparateur (35) avec un cylindre accumulateur, un ressort accumulateur (38) et un piston accumulateur,
    un capteur de déplacement (39) détecte le coulissement du piston accumulateur, et
    entre le clapet antiretour (18) associé à l'injecteur (10) et la conduite de dosage (24) reliée à celui-ci, il est prévu un élément de commutation à commande hydraulique (20) dont l'entrée de commande est reliée à la sortie de la pompe d'injection de carburant (23) et au-dessus d'une pression correspondant sensiblement à la pression statique réglée par la soupape isobar (17), il ferme le branchement de buse (16).
  3. Installation selon la revendication 2,
    caractérisée en ce que
    l'injecteur (10), la soupape isobar (17) reliée à un branchement (15) de l'injecteur, le clapet antiretour (18) relié à l'autre branchement (16) de l'injecteur et l'élément de commutation (20) sont réunis en un ensemble (module d'injecteur 30) qui comprend un premier branchement (21) relié à la soupape isobar (17) pour une conduite d'injection (22) reliée à la sortie d'alimentation de la pompe d'injection (23), un second branchement (24) relié à l'élément de commutation (20) pour la conduite de dosage (34) et un troisième branchement (26) relié de préférence par l'intermédiaire d'un second clapet antiretour (19), intégré au premier branchement (21) pour le dispositif à distributeur (27), et
    l'entrée de commande de l'élément de commutation (20) est reliée au premier branchement (21).
  4. Installation selon les revendications 2 et 3,
    caractérisé en ce que
    le dispositif à distributeurs (27) comprend deux distributeurs à tiroir 2/2 voies à électroaimant (41, 42) et rappel par ressort, reliés par l'entrée chaque fois à la sortie d'alimentation de la pompe d'injection de carburant (23) de préférence à la troisième sortie (26) de l'ensemble (module d'injecteur 30), le premier distributeur (41) étant relié par sa sortie à la conduite de décharge (40) et le second distributeur (42) étant relié en sortie au piston séparateur (35).
  5. Installation selon les revendications 2 et 3, caractérisée en ce que
    le dispositif à distributeurs (27) comprend deux distributeurs à tiroirs à 2/2 voies à électroaimant (41, 42) avec rappel par ressort,
    le premier distributeur (41) est relié en entrée à la sortie d'alimentation de la pompe d'injection de carburant (23) de préférence avec la troisième sortie (26) de l'ensemble (module d'injecteur 30) et en sortie à la conduite de décharge (40), et
    le second distributeur (42) est relié en entrée au piston séparateur (35) et en sortie à la conduite de décharge (40), et
    entre les entrées du premier et du second distributeur (41, 42) on a un clapet antiretour (43) dont le sens passant est dirigé vers le second distributeur (42) et sa section de passage est supérieure à celle du second distributeur (42) .
  6. Installation d'injection selon la revendication 4 ou 5,
    caractérisée en ce que
    une unité de commande électronique ferme les deux distributeurs (41, 42) pendant la durée de l'injection de carburant, et à la fin de l'injection, elle ouvre le second distributeur (42) suivant un premier signal du capteur de course (39) signalant un coulissement du piston de l'accumulateur à ressort (37) selon une course de translation prédéterminée,
    le second distributeur (42) se ferme de nouveau et le premier distributeur (41) s'ouvre,
    et en fonction d'un second signal du capteur de course (39), indiquant le retour du piston accumulateur dans l'accumulateur à ressort (37) dans sa position de base, le second distributeur à tiroir (42) s'ouvre de nouveau.
  7. Installation selon la revendication 1,
    caractérisée en ce que
    le générateur de pression (33) comprend un démultiplicateur de pression (45) avec un piston étagé (52) coulissant contre un ressort de rappel (51), ce piston délimitant avec sa partie de grand diamètre (251), une chambre de commande (53) reliée au dispositif à distributeur (27) et par sa partie de piston de petit diamètre (522) à une chambre de refoulement 54 raccordée à la pompe de préalimentation (31) d'additif liquide,
    le dispositif de dosage (25) possède pour l'additif liquide, un distributeur (46) avec un cylindre distributeur (47) ayant plusieurs perçages d'évacuation (48) disposés radialement et répartis régulièrement à la périphérie et un arbre distributeur (49) tournant dans le distributeur en étant entraíné par la pompe d'injection de carburant (23), cet arbre étant relié à la chambre de refoulement (54) du démultiplicateur de pression (45) et en cas de rotation de l'arbre distributeur (49), un perçage distributeur (50) de cet arbre venant en communication avec chacun des perçages de sortie (48) et
    la conduite de dosage (34) est reliée à un perçage de sortie (50) du distributeur (46) pour l'injecteur (10).
  8. Installation selon la revendication 7,
    caractérisée en ce que
    la chambre de refoulement (54) comporte un clapet d'entrée et un clapet de sortie (55, 56), ces deux clapets étant réalisés sous forme de clapets d'arrêt.
  9. Installation selon les revendications 7 ou 8,
    caractérisée en ce que
    le dispositif à distributeurs (27) comprend au moins un premier distributeur à tiroir 2/2 voies commandé par électroaimant (41) avec rappel par ressort et un second distributeur à tiroir 2/2 voies (42) à électroaimant avec ressort de rappel, et les deux distributeurs à tiroir (41, 42) sont branchés en série, le premier distributeur (41) étant relié en entrée à la sortie d'alimentation de la pompe d'injection de carburant (23) et la sortie du second distributeur à tiroir (42) étant reliée à la conduite de décharge (40) .
  10. Installation selon la revendication 9,
    caractérisée en ce que
    la pompe d'injection de carburant (23) est une pompe d'injection distributrice ayant un piston distributeur tournant lors du mouvement de déplacement de la pompe et l'arbre (49) du distributeur (46) du dispositif de dosage (25) est entraíné en synchronisme par le piston distributeur ou est intégré directement dans celui-ci.
  11. Installation selon la revendication 9,
    caractérisée en ce que
    la pompe d'injection de carburant (23) est une pompe d'injection de type série ayant pour chaque sortie d'alimentation un piston de pompe entraíné en translation par un arbre à cames,
    l'arbre (49) du distributeur (46) du dispositif de dosage (25) étant entraíné par l'arbre à cames,
    le dispositif à distributeurs (27) ayant un nombre de sorties d'alimentation correspondant au nombre des premiers distributeurs (41) avec ressort de rappel et
    la liaison entre le premier distributeur (41) et le second distributeur (42) se fait chaque fois par l'intermédiaire d'un clapet antiretour (59) dans le sens passant et tourné vers le second distributeur (42).
  12. Installation selon l'une des revendications 7 à 11,
    caractérisée par
    une unité de commande électronique qui ferme le premier distributeur à tiroir (41) pendant la durée de l'injection de carburant, ouvre le premier distributeur (41) à la fin de l'injection et après une durée prédéterminée, ferme le second distributeur (42) et après avoir atteint le point mort haut par le piston de pompe ou le distributeur, la pompe d'injection de carburant (23) ouvre de nouveau le second distributeur à tiroir (42).
  13. Installation selon l'une des revendications 7 à 12,
    caractérisée en ce que
    le piston étagé (52) est réalisé en deux parties, le piston (521) de grand diamètre recevant le ressort de rappel (51) et le piston (522) de petit diamètre étant soumis à l'action d'un ressort de rappel (65), et
    les deux pistons (521, 522) s'appuient par leurs faces frontales tournées l'une vers l'autre sous l'effet du ressort de rappel (51) et du ressort applicateur (65) contre un poussoir (64) coulissant, prévu entre ces deux faces.
EP96111968A 1995-08-30 1996-07-25 Dispositif d'injection Expired - Lifetime EP0760425B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE19531812 1995-08-30
DE19531812 1995-08-30
DE19619522 1996-05-15
DE19619522A DE19619522A1 (de) 1995-08-30 1996-05-15 Einspritzeinrichtung

Publications (2)

Publication Number Publication Date
EP0760425A1 EP0760425A1 (fr) 1997-03-05
EP0760425B1 true EP0760425B1 (fr) 2000-11-15

Family

ID=26018106

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96111968A Expired - Lifetime EP0760425B1 (fr) 1995-08-30 1996-07-25 Dispositif d'injection

Country Status (3)

Country Link
US (1) US5671717A (fr)
EP (1) EP0760425B1 (fr)
JP (1) JPH09126085A (fr)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19625698B4 (de) * 1996-06-27 2005-09-22 Robert Bosch Gmbh Einspritzeinrichtung zum kombinierten Einspritzen von Kraftstoff und Zusatzflüssigkeit
DE19706661A1 (de) * 1997-02-20 1998-08-27 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
DE19715785C2 (de) * 1997-04-16 1999-12-09 Mtu Friedrichshafen Gmbh Kraftstoffinjektor für eine Brennkraftmaschine für Kraftstoff/Emulsionsbetrieb
DE19746492A1 (de) * 1997-10-22 1999-04-29 Bosch Gmbh Robert Kraftstoffeinspritzanlage für eine Brennkraftmaschine
DE19939426A1 (de) * 1999-08-20 2001-03-01 Bosch Gmbh Robert Kraftstoffeinspritzsystem für eine Brennkraftmaschine
DE102010050560A1 (de) * 2010-11-05 2012-05-10 Volkswagen Ag Kraftstoffhochdruckpumpe für eine Brennkraftmaschine mit Direkteinspritzung
JP2012102631A (ja) * 2010-11-08 2012-05-31 Mitsubishi Heavy Ind Ltd 内燃機関の燃料噴射装置
RU2470176C1 (ru) * 2011-05-05 2012-12-20 Закрытое акционерное общество "Научно-производственное объединение АРКОН" Способ работы бортовой водотопливной системы двигателя внутреннего сгорания
US9303607B2 (en) * 2012-02-17 2016-04-05 Ford Global Technologies, Llc Fuel pump with quiet cam operated suction valve
US9079142B2 (en) 2013-03-11 2015-07-14 Oms Investments, Inc. Hydraulic mixing device for sprayer system
CN105351086B (zh) * 2015-12-01 2018-04-10 苟仲武 一种柴油乳化改进发动机性能的工作方法及装置
DE102016015037B3 (de) * 2016-12-16 2018-05-30 L'orange Gmbh Kraftstoffinjektoranordnung
CN108435643B (zh) * 2017-03-13 2024-05-28 重庆铂汉塑胶有限公司 一种应用于流水线产品的清洁装置
US10563609B2 (en) * 2017-11-16 2020-02-18 Caterpillar Inc. Fuel injector
FR3077340B1 (fr) * 2018-01-29 2022-07-15 Plastic Omnium Advanced Innovation & Res Systeme d'injection d'une solution aqueuse dans un moteur a injection

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4691674A (en) * 1984-10-13 1987-09-08 Diesel Kiki Co., Ltd. Multistage fuel injection system for internal combustion engines
IT1202610B (it) * 1987-03-03 1989-02-09 Parmenide Srl Dispositivo per l'iniezione in motori a combustione interna di emulsioni combustibili a rapporto prontamente variabile
US5170751A (en) * 1990-05-23 1992-12-15 Mitsubishi Jukogyo Kabushiki Kaisha Water-injection diesel engine
US5245953A (en) * 1991-07-31 1993-09-21 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Emulsion fuel engine
US5174247A (en) * 1992-01-22 1992-12-29 Mitsubishi Jukogyo Kabushiki Kaisha Water injection diesel engine
JP3212408B2 (ja) * 1993-03-31 2001-09-25 三菱重工業株式会社 燃料・水噴射装置
DE4337048C2 (de) * 1993-10-29 1996-01-11 Daimler Benz Ag Kraftstoffeinspritzanlage für eine Brennkraftmaschine
DE4407052C1 (de) * 1994-03-03 1995-03-09 Mtu Friedrichshafen Gmbh Einspritzanlage für die Einspritzung eines Kraftstoffs und einer Zusatzflüssigkeit in die Brennräume einer Brennkraftmaschine

Also Published As

Publication number Publication date
EP0760425A1 (fr) 1997-03-05
JPH09126085A (ja) 1997-05-13
US5671717A (en) 1997-09-30

Similar Documents

Publication Publication Date Title
DE3227742C2 (fr)
DE3788406T2 (de) Elektronisch gesteuertes Einspritzsystem.
DE4233273C2 (de) Hochdruck-Pumpe für eine Kraftstoff-Einspritzanlage mit einer gemeinsamen Druckleitung (common rail)
DE19581047B4 (de) Hydraulisch betätigte elektronisch gesteuerte Brennstoffeinspritzvorrichtung
EP0760425B1 (fr) Dispositif d'injection
EP0116168B1 (fr) Pompe d'injection de combustible
DE2558789C2 (fr)
EP0393412B1 (fr) Dispositif d'injection de combustible, en particulier injecteur à pompe, pour moteurs à combustion interne
EP1125046B1 (fr) System d'injection de carburant pour un moteur à combustion interne avec un multiplicateur de pression
EP1078160A1 (fr) Systeme d'injection de carburant
DE19832287A1 (de) Nadelgesteuerte Kraftstoffinjektoreinheit
DE69124228T2 (de) Elektronische Hochdruckeinspritzkraftstoffleitung für Dieselmotoren
DE3310049A1 (de) Kraftstoffeinspritzeinrichtung zur einspritzung einer aus mindestens zwei komponenten bestehenden kraftstoffmischung
DE69923108T2 (de) Brennstoffsystem und Pumpe zur Anwendung in einem solchen System
EP0462404A1 (fr) Système d'injection de combustible pour moteurs à combustion interne
DE19603435A1 (de) Von Einspritzratenform- bzw. -gestaltungssteuerung geöffnetes Rückschlagventil für eine Brennstoffeinspritzdüse
WO2000039450A1 (fr) Pompe a piston pour carburant sous haute pression
DE19625698A1 (de) Einspritzeinrichtung zum kombinierten Einspritzen von Kraftstoff und Zusatzflüssigkeit
DE3923271A1 (de) Kraftstoffeinspritzeinrichtung fuer brennkraftmaschinen, insbesondere pumpeduese
DE3743532A1 (de) Kraftstoffeinspritzanlage fuer brennkraftmaschinen
DE4341739C1 (de) Einspritzsystem
WO2001012982A1 (fr) Dispositif d'injection de carburant
CH671809A5 (fr)
EP0032172B1 (fr) Installation d'injection de combustible pour moteurs à combustion interne, notamment pour moteurs Diesel
DE19613520A1 (de) Einspritzanlage

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE FR GB IT

17P Request for examination filed

Effective date: 19970905

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

17Q First examination report despatched

Effective date: 20000211

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE FR GB IT

REF Corresponds to:

Ref document number: 59606137

Country of ref document: DE

Date of ref document: 20001221

ET Fr: translation filed
ITF It: translation for a ep patent filed

Owner name: STUDIO JAUMANN P. & C. S.N.C.

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)

Effective date: 20010123

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20030625

Year of fee payment: 8

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20030716

Year of fee payment: 8

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20040725

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20040725

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20050331

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 20050725

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20070921

Year of fee payment: 12

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20090203